Access management treatments inherently reduce conflict points along urban arterial roadways. The reduction in conflict has translated to a reduction in crashes that has been documented in numerous studies looking at before and after conditions when access management treatments (i.e., raised median installation, driveway consolidation) are implemented. Crash rate reductions as high as 50 percent have been reported in these analyses.

Modern roundabouts have been shown to be a safe and efficient alternative to more traditional roadway intersection designs. They are much more efficient than signalized intersections in many situations in that traffic is allowed to remain in motion albeit at a slower speed. Safety is often improved since traffic speed through the roundabout is reduced and the most serious types of conflicts are reduced or eliminated.